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CFA Level I · CFA Level I Exam · Fixed-Income Securitization

Relative to a pass-through security, a planned amortization class (PAC) tranche in a collateralized mortgage obligation is most likely to have:

A PAC tranche is protected from both contraction and extension risk as long as actual prepayments stay within its established band, since support tranches absorb the variation. This makes its cash flows more predictable than those of a pass-through.

  1. Agreater prepayment uncertainty, because it absorbs all prepayments
  2. Bprotection from contraction and extension risk within a prepayment bandCorrect
  3. Cno exposure to prepayment, because it holds only interest payments

Explanation

A PAC has a schedule of principal payments that is maintained as long as prepayments stay within the initial band, because support tranches absorb the excess or shortfall. It is not immune outside the band, and it does not hold only interest.

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